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jfs_superblock.h

/*
 *   Copyright (c) International Business Machines Corp., 2000-2002
 *
 *   This program is free software;  you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 *   the GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program;  if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
#ifndef     _H_JFS_SUPERBLOCK
#define _H_JFS_SUPERBLOCK

#ifndef _H_JFS_LOGMGR
#include <uuid/uuid.h>
#endif

/*
 *    jfs_superblock.h
 */

/*
 * make the magic number something a human could read
 */
#define JFS_MAGIC       "JFS1"      /* Magic word: JFS 1 */

#define JFS_VERSION     2     /* Version number: Version 2 */

#define LV_NAME_SIZE    11    /* MUST BE 11 for OS/2 boot sector */

/*
 *    aggregate superblock
 */
struct superblock {
      char s_magic[4];  /* 4: magic number */
      uint32_t s_version;     /* 4: version number */

      int64_t s_size;         /* 8: aggregate size in hardware/LVM blocks;
                         * VFS: number of blocks
                         */
      int32_t s_bsize;  /* 4: aggregate block size in bytes;
                         * VFS: fragment size
                         */
      int16_t s_l2bsize;      /* 2: log2 of s_bsize */
      int16_t s_l2bfactor;    /* 2: log2(s_bsize/hardware block size) */
      int32_t s_pbsize; /* 4: hardware/LVM block size in bytes */
      int16_t s_l2pbsize;     /* 2: log2 of s_pbsize */
      int16_t pad;            /* 2: padding necessary for alignment */

      uint32_t s_agsize;      /* 4: allocation group size in aggr. blocks */

      uint32_t s_flag;  /* 4: aggregate attributes:
                         *    see jfs_filsys.h
                         */
      uint32_t s_state; /* 4: mount/unmount/recovery state:
                         *    see jfs_filsys.h
                         */
      int32_t s_compress;     /* 4: > 0 if data compression */

      pxd_t s_ait2;           /* 8: first extent of secondary
                         *    aggregate inode table
                         */

      pxd_t s_aim2;           /* 8: first extent of secondary
                         *    aggregate inode map
                         */
      uint32_t s_logdev;      /* 4: device address of log */
      int32_t s_logserial;    /* 4: log serial number at aggregate mount */
      pxd_t s_logpxd;         /* 8: inline log extent */

      pxd_t s_fsckpxd;  /* 8: inline fsck work space extent */

      struct timestruc_t s_time;    /* 8: time last updated */

      int32_t s_fsckloglen;   /* 4: Number of filesystem blocks reserved for
                         *    the fsck service log.
                         *    N.B. These blocks are divided among the
                         *         versions kept.  This is not a per
                         *         version size.
                         *    N.B. These blocks are included in the
                         *         length field of s_fsckpxd.
                         */
      int8_t s_fscklog; /* 1: which fsck service log is most recent
                         *    0 => no service log data yet
                         *    1 => the first one
                         *    2 => the 2nd one
                         */
      char s_fpack[11]; /* 11: file system volume name
                         *     N.B. This must be 11 bytes to
                         *          conform with the OS/2 BootSector
                         *          requirements
                         *          Only used when s_version is 1
                         */

      /* extendfs() parameter under s_state & FM_EXTENDFS */
      int64_t s_xsize;  /* 8: extendfs s_size */
      pxd_t s_xfsckpxd; /* 8: extendfs fsckpxd */
      pxd_t s_xlogpxd;  /* 8: extendfs logpxd */
      /* - 128 byte boundary - */

      uuid_t s_uuid;          /* 16: 128-bit uuid for volume */
      char s_label[16]; /* 16: volume label */
      uuid_t s_loguuid; /* 16: 128-bit uuid for log device */
};

#endif /*_H_JFS_SUPERBLOCK */

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